1- How important is white label and personalization to you. Would you pay much more to have these options?
2- Some of them, determine price only on the number of fans/followers that you have, on the other hand others offer different functionalities in each plan. Which model is more fair?
3 - Some of them have a monthly plan, while others charge per promo or have a setup fee. What do you think?
4 - Finally, there are some that charge per usage, or based on the number of leads/interactions that your promo have. Given that you don't know in advance how much you will pay (depends on how successful your promo is), do you think companies like that?